Rose Kennedy Greenway officials plan to launch a 220-foot zip line through downtown starting next month, marking another bid by the nonprofit to stir up revenue but also utilize a slice of city parkland the state has long left unfinished.

Set to open early next month, the 30-foot-high, double-corded zip line will carry two riders side-by-side over a patch of the 17-acre park that runs between Clinton and North streets near Faneuil Hall.

It’s slated to run into September at $8 a ride, and while tucked alongside a ramp to an underground highway tunnel, Greenway officials say it will be “entirely contained” along a 100-yard grassy area and will not actually cross the ramp or any roads.

The one-year pilot, operated by the company NY Carousel Entertainment, follows plans to open a beer garden on another section of the park at a time the Kennedy Greenway Conservancy is locked into talks with state officials over a new lease.

MassDOT has for years urged the nonprofit to wean itself from the $2 million in state funds it gets. Its current lease ends June 30, and state and Conservancy officials are still negotiating what, if any, state funding it could receive.

Under the zip line agreement, NY Carousel will both staff and operate the ride, and cover startup costs, which officials say could run $125,000. The Conservancy will then reap 10 percent to 20 percent of revenues, depending on its popularity. The nonprofit hosted a free, three-day “pop-up” zip line in February in Dewey Square Park, which drew 6,000 people.

Greenway officials have said they’re trying to add to the nearly $1 million in earned income they generate annually. But the main intent of the zip line is to use a stretch of the park that has featured art installations and lawn games but little else, given most of it is eaten up by two ramps connecting to Interstate 93 below.

“The income is not one of our biggest motivations on this one,” said Michael Nichols, the nonprofit’s chief of staff, adding that it will “make some longer-term decisions” depending on the pilot’s success. “We still don’t have the capability to use this as much as other parcels on the Greenway.”

That’s in part because the ramps still have wide openings, despite an agreement dating back to the Big Dig that the state cover them. MassDOT launched a study in 2014, which included potentially adding walkways and green space to the lot. But it was put on a “break” in April 2015, according to online city documents, and its current status is unclear. MassDOT declined comment yesterday.

“There are some pieces of the Big Dig construction that are still not complete, 25 years later, and this is certainly one of them,” said state Rep. Aaron M. Michlewitz, a North End Democrat. “I would like to see it re-energized. It’s very disappointing.”